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- Rook, Bishop and King1100Codeforcesgraphsmathshortest paths
- Rotate, Flip and Zoom1200Codeforces*specialimplementation
- Row1200Codeforcesbrute forceconstructive algorithms
- Row and Column Operations1467CodeChef
- Rudolf and the Another Competition1200Codeforcesconstructive algorithmsdata structuresdpgreedy
- Rudolf and the Ball Game1200Codeforcesdfs and similardpimplementation
- Rudolph and Christmas Tree1200Codeforcesconstructive algorithmsgeometrymath
- Run For Your Prize1100Codeforcesbrute forcegreedy
- Running Student1200Codeforcesbrute forcegeometryimplementation
- SMSC1100Codeforcesimplementation
- Sagheer and Crossroads1200Codeforcesimplementation
- Sail1200Codeforcesbrute forcegreedyimplementation
- Sakurako's Hobby1100Codeforcesdpdsugraphsmath
- Salem and Sticks 1100Codeforcesbrute forceimplementation
- Same Differences1200Codeforcesdata structureshashingmath
- Same Parity Summands1200Codeforcesconstructive algorithmsmath
- Sanatorium1200Codeforcesbinary searchconstructive algorithmsgreedyimplementation
- Save the Magazines1100Codeforcesconstructive algorithmsdpgreedy
- Scuza1200Codeforcesbinary searchgreedymath
- Seating Arrangements (easy version) 1100Codeforcesdata structuresgreedysortings
- Secret Box1200Codeforcesbrute forcecombinatoricsmath
- Security Lines1416CodeChef
- Sell Upto 21560CodeChef
- Sequence Transformation1200Codeforcesgreedyimplementation
- Sequence with Digits1200Codeforcesbrute forceimplementationmath
- Sequential Nim1100Codeforcesdpgames
- Sereja and ASum1559CodeChef
- Sereja and Array1200Codeforcesimplementation
- Sereja and Array and Subtracting1559CodeChef
- Sereja and Contests1200Codeforcesgreedyimplementationmath
- Sereja and Stairs1100Codeforcesgreedyimplementationsortings
- Sereja and Suffixes1100Codeforcesdata structuresdp
- Sereja and Votes1586CodeChef
- Serval and Final MEX1200Codeforcesconstructive algorithmsimplementation
- Serval and Toy Bricks1200Codeforcesconstructive algorithmsgreedy
- Set Size1583CodeChef
- Set of Strangers1200Codeforcesgreedymatrices
- Set of Strings1100Codeforcesimplementationstrings
- Sets Diff by K1474CodeChef
- Settlers' Training1200Codeforcesimplementation
- Sherlock and his girlfriend1200Codeforcesconstructive algorithmsnumber theory
- Shifting Sort1100Codeforcesimplementationsortings
- Shohag Loves XOR (Easy Version)1200Codeforcesbitmasksbrute forcemathnumber theory
- Shooshuns and Sequence 1200Codeforcesbrute forceimplementation
- Shovels and Swords1100Codeforcesbinary searchgreedymath
- Shower Line1200Codeforcesbrute forceimplementation
- Shrinking Array1100Codeforcesbrute forcegreedy
- Sifid and Strange Subsequences1100Codeforcesgreedymathsortings
- Sign Flipping1100Codeforcesconstructive algorithmsmath
- Similar Pairs1100Codeforcesconstructive algorithmsgraph matchingsgreedysortings
- Simple Molecules1200Codeforcesbrute forcegraphsmath
- Single Wildcard Pattern Matching1200Codeforcesbrute forceimplementationstrings
- Skibidus and Fanum Tax (easy version)1100Codeforcesbinary searchdpgreedy
- Skibidus and Sigma1200Codeforcesgreedysortings
- Slavic's Exam1100Codeforcesgreedyimplementationstrings
- Slice to Survive1200Codeforcesbitmasksgreedymath
- Slightly Decreasing Permutations1100Codeforcesgreedyimplementation
- Small, Smaller, Smallest1403CodeChef
- Smallest KMP1538CodeChef
- Smart Strategy1583CodeChef